[Fot] Verifying if a crank surface is nitrided

[Scypher@USA.com]

This is the problem.  The previous owner doesn't know the history and  
nor do I....  I'd like to know if there a test that can be done (ie  
surface hardness)

Thanks
-S


On Jul 14, 2007, at 2:16 PM, "Chuck Arnold" <triosan at gmail.com> wrote:

> I had a stock sized one nitrited, then needed to get it to .010  
> under [burned a rod bearing running with no oil pressure].  Mt  
> engine builder said no problem -- nitriitng is good for at least . 
> 020.  So it depends on at what stage of their grinding life they  
> were at when nitrad
>
> On 7/14/07, Scypher @ USA. com <scypher at usa.com> wrote:
> I have a number of spare spit 1500 cranks that were clearly nitrided
> at some point in their life, but are at the 020 030 and even 040 under
> stage of their life.
>
> How do I determine there is enough of a nitrided layer left?  I need
> to decide about prepping a new crank and nitriding, or turning down an
> already prepped crank to the next size.
>
> Can anyone verify if stock 1500 cranks came with any nitriding from
> the factory?
>
> Thanks
> -Scott
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> -- 
> Chuck Arnold